The Agrostidoideous flora on the coastal region of Hainan Island consists of 140 species in 82 genera. It is conspicuous for tropical elements. The tropical areal - types of genera take up 94.6％ of the total ones. In the total genera, pantropies, old world tropics, tropical Asia to tropical Africa takes up 47.30％, 16.22％ and 13.51％,respectively. In the level of species the tropical elements accounts for 78.9％ of the total with the tropical Asia ones accounting for 35. 16％, the old world tropics for 14. 84％, the tropical Asia to tropical Australasia ones for 12. 50％,and the pantropics for 11.72 ％. The flora has a lot of monodominant species or dominant species in the coastal communities. The relationships of the Agrnstidoideous flora between the coastal region of Hainan with its vicinity are analysed. Concise assessment on the Agrostidoideous resources in the coastal region of Hainan is presented in the paper.%海南海岸禾草植物区系有野生植物140种(含变种、亚种)、82属.本区系热带性质明显,热带分布属占总属数(除去世界属和外来属)的94.6%,以泛热带分布、古热带分布、热带亚洲至热带非洲分布为主,分别占总属数的47.30%、16.22%、13.51%;热带分布种占总种数(除去广布种和外来种)的78.9%,又以热带亚洲分布、古热带分布、热带亚洲至热带大洋洲分布及泛热带分布为主,分别占总种数的35.16%、14.84%、12.50%、11.72%;该区系拥有较多的海岸植物群落优势种;探讨了本区系与周边地区、各大洲热带地区植物区系的联系;简要评价本区禾草植物资源.
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